nixpkgs/pkgs/servers/x11/xorg/builder.sh
Maximilian Bosch 8bc5104a6e
treewide: refactor .attrs.sh detection
When specifying the `builder` attribute in `stdenv.mkDerivation`, this
will be effectively transformed into

    builtins.derivation {
      builder = stdenv.shell;
      args = [ "-e" builder ];
    }

This also means that `default-builder.sh` is never sourced and as a
result it's not guaranteed that `$NIX_ATTRS_SH_FILE` is set to a correct
location[1].

Also, we need to source `.attrs.sh` to source `$stdenv`. So, the
following is done now:

* If `$NIX_ATTRS_SH_FILE` points to a correct location, then use it.
  Directly using `.attrs.sh` is problematic for `nix-shell(1)` usage
  (see previous commit for more context), so prefer the environment
  variable if possible.

* Otherwise, if `.attrs.sh` exists, then use it. See [1] for when this
  can happen.

* If neither applies, it can be assumed that `__structuredAttrs` is
  turned off and thus nothing needs to be done.

[1] It's possible that it doesn't exist at all - in case of Nix 2.3 or
    it can point to a wrong location on older Nix versions with a bug in
    `__structuredAttrs`.
2023-10-04 18:36:57 +02:00

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if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
# This is the builder for all X.org components.
source $stdenv/setup
# After installation, automatically add all "Requires" fields in the
# pkgconfig files (*.pc) to the propagated build inputs.
origPostInstall=$postInstall
postInstall() {
if test -n "$origPostInstall"; then eval "$origPostInstall"; fi
local r p requires
set +o pipefail
requires=$(grep "Requires:" ${!outputDev}/lib/pkgconfig/*.pc | \
sed "s/Requires://" | sed "s/,/ /g")
set -o pipefail
echo "propagating requisites $requires"
for r in $requires; do
for p in "${pkgsHostHost[@]}" "${pkgsHostTarget[@]}"; do
if test -e $p/lib/pkgconfig/$r.pc; then
echo " found requisite $r in $p"
propagatedBuildInputs+=" $p"
fi
done
done
}
installFlags="appdefaultdir=$out/share/X11/app-defaults $installFlags"
if test -n "$x11BuildHook"; then
source $x11BuildHook
fi
enableParallelBuilding=1
enableParallelInstalling=1
genericBuild